Quote Originally Posted by 01Grand PrixGT View Post
But when it has never had a fluid change in its life, new fluid will destroy the seals and other stuff in the transmission, making more problems. I ended up sucking out about enough to fill up half a bottle of pepsi (bout 10 or 12fl oz) and added maybe half the bottle of the fix fluid. May add more if I feel like it. Car drives and shifts through all the gears, but the shift is a bit delayed now, and I expected that because it is literally running a gel through it right now so all is good. The fluid I took out was almost black hahahaha.

I'm going to try to make this very simple for you. The car is on original fluid and original filter. the fluid is contaminated by now and the filter is clogged hence the slipping. It is not recommended to FLUSH a trans that has not been flushed every 50k on original fluid because all the clutch pack material is what is keeping the clutch packs engaging. Think of a brake pad with no pad material left. It is however recommended to do a filter/fluid change and keep the fluid that is in the torque converter( aka not flushing) Running dex 6 is not recommended on a old trans because it is thinner, granted it is better in every other way(by %200) should def be used on a new or rebuilt trans. With only 123k your only chance at saving that trans is to drop pan and change filter/fluid. The trango shift kit is recommended because the reason these cars tend to wear clutch packs and start to slip is because picture riding your brakes oh so slightly while also pressing the throttle driving down the road and then finally applying the brakes fully and letting your foot off the throttle. Its gonna wear the **** out of your pads. The shift kit increases line pressure so the clutch packs don't drag persay before fully engaging.